The only hiccups i came across was that the Phillips #00 screwdriver didn't really want to fit the 11mm screws in step 4. So i striped one of the screws a little bit. Maybe it requires a different size. Also i wish that there was a link to show the process in reverse but it's easy enough to figure out. Overall the process was painless, the instructions are short and simple and the pictures are an amazing aid. I took it at an easy pace with music playing in the background on my iPhone. So I have just finished installing a Samsung 500gb Solid State Drive (pre loaded with El Capitan) into my little MacBook. She booted right up and now with an upgraded hard drive, a little extra Ram, and a updated OSX, i have just extended the life of my little old Macbook. It's now the perfect travel/school laptop with out having to risk loosing, damaging or getting my new MacBookPro stolen.